Speed-meter.



YPATENTBD AUG. 4; "1908. GJ. STUART-g SPEED METER. APPLICATION FILED my 10. 1907.

and useful dulum- TcaZZ whom may concern:

Be it known that I, CHARLES JOURDEAN STUART. a subject of the King of Great Britain, and resident of 117 Duluth avenue, in

I the city of Montreal, in the district of Montreal, in the Province of Quebec, in the Dominion of Canada, have invented certain new Improvements in Speed-Meters, of which th following is a specification.

The invention consists in the novel arrangement and construction of parts where by a penduhnn is utilized to measure the pe riod of time elapsiug during the number of revolutions of the shaft.

The object of the invention is to eliminate many of the inconveniences incident to the usual methods employed for determining the number cf revolutions per minute of a shaft.

Figure 1 is a perspective view of a speed meter showing thependulum attachment. Fig. 2 is a perspective detail of the arrangement of bracket from which the pendulum is suspended. Fig. 3 is a perspective view of a modified form of bracket. Fig. 4 is a perspective view of the modified form of pen- Fig. 5 is a perspective view of'another form of sendulum. spective view oi luin.

Like numerals of reference indicate eorre spondir g parts in each figure.

Referring to the drawings, 1 is a case containing the speed counting mechanism and 2 the handle joined to said case and 3 the tip.

4 are screw holes through the lugs 5 projecting front the case 1. 1

6 is a screw inserted in one of the screw holes 4. 7

7 i a sleeve encircling the screw 6 adjacent to the head thereof and having the annular recesses S in its periphery diametrically opposite- 9 is a stirrup having the ends thereof sprung into the recesses S in the sleeve 7.

10 is a pin rocking in the stirrup 9 and joining the ends of the upper link of the chain 11.

. 12 is a threaded pin secured at the lower end of still another form of pendur1119 chain 11.

13 is the weight having a longitudinal and threaded orifice corresponding to and turning on the pin 12.

14 is a thumb nut for locking the weight 13 d position on the pin 12.

3 another form of bracket is shown from winch the pendulum swings, in which Specification of LettersPatent. Application mid May 10, 1907. I Serial 110,372,882.

Fig. 6 is a per CHARLES JOURDEAXSTYIART, OF MONTREAL, QUEBEC, CANADA.I

SPEEDJMETER.

the bracket piece 15 is held to the case 1 by the screw 16 extending through the end of; said bracket piece and one of said screw holes 4.

17 is the stirrup secured to the end of the bracket piece 15 and corresponding to the stirrup 9 shown in the'first form described.-

In Figs. 4, 5 and 6 other forms of pendulum are shown indicating that another suitable type of pendulum may be used.

Patented Aug. 4, 1908.

1 ins STATES PATENT orrrcn r- In Fig. 4 instead of a chain, a stiff rod 18 is used with a flattened flexible piece 19 suitably secured to the handle or other part of the speed meter.

In Fig. 5 the pendulum is of the metronome type and need not further be described herein except that the bracket 20 projects re'arwardly therefrom and is secured in one of thescrew holes 4 by a suitable screw.'

In Fig. 6 a spinning form of endulum is shown suspended from the brac ct piece 21 secured to the case 1 at one of the screw holes 4 in a similar manner to the securing of the bracket 20 or the bracket piece 15.

In the o eration of this instrumentcoincidently wit 1 the application of the tip to the shaft, the pendulum is swung and moves in regular beats, the said beats being counted as they occur, Atthe ex iration of ten elapsed beats or more if desired? but ten will be quite sutlicicnt, the tip is removed from contact with the shaft and the speedcounting mech anism will then show the number of revolutions made during the said ten beats of the pendulum, the pendulum isregulated so that each beat will be equivalent to a certain space of time and the ten elapsed beats, say for example, will be equivalent to one-tenth of a minute, therefore at the expiration of the ten beats subsequent to the removal of the instrument from engagement with the shaft, the indicating disk of the speed counting mechanism will show the number of revolutions during the said ten beats orduring one-tcnth of a minute and this multiplied by ten will give the revolutions per minute of the shaft. This arrangement of pendulum with the speed counting mechanism is very simple and very effective as any ordinary workman can readily count the heats up to ten or more and multiply to find the revolutions per minute.

\Vhat I claim as my invention is:

1. In a speed meter, the combination with a speed counting mechanism, of a pendulum swinging from said meter and adapted to measure by its oscillations during the operat onof said count-mg mechanism, the period of time elapsmg during each operation, substantially as described.

2. In a speed meter, the combination with a speed counting mechanism, of a chain hav-- ing an adjustable weight at its lower end and forming a pendulum, and a bracket secured to the meter frame and suspending said pendulum, substantially as described.

3. In a speed meter, the combination .with a speed counting mechanism, of a pendulum having an adjustable weight, a bracket in the form of a stirrup secured to the meter frame by a suitable screw and a pin secured to the top end of said chain and assembled with said support, substantially as described.

4. In a speed meter, in combination, a case having a lug therefrom, said lug having a threaded hole therethrough, a bracket, a threadedpin securing said bracket in said hole and an adjustable eight suitably suspended from said bracket, substantially as described.

5. In a speed meter, in combination,'a case having a lug therefrom and athreaded hole through said lug, abracket, a threaded pin 1 holding said bracket to said lug, a threaded pin, 'a weight turning on said threaded pin, a threaded pin inserted in said Weight locking the other pin therein, and means for suspending said weight from said bracket, substantially as described.

6. In a device of the class described, in combination, a case, means for indicating the revolutions of a moving member of a ma.- chine, and a pendent attachment for measuring the time of the said revolution in relation to said indicating means, substantially as described. Y

Signed at the city of Montreal, in the district of Montreal, in the Province of Quebec, in the Dominion of Canada, this sixth day of May, 1907. v CHARLES JOURDEAN' STUART.

Witnesses:

' LLOYD BLACKMORE,

' P. ,SHE 

